Rapid Replacing Structure for Multi-purpose Saw

ABSTRACT

The present invention proposes a rapid replacing structure for multi-purpose saw, including the operating mechanism, clamping mechanism and collet; the collet is released or clamped by driving the clamping mechanism through the operating mechanism; in addition, the structure also comprises an output shalt whose top and bottom openings form a chamber; the collet is placed in the output shaft; the clamping mechanism comprises a spring element that clings to the outer side of collet, a collet sleeve and a compressor arm; one end of the spring element is connected to the bottom wall of chamber, while the other is connected with the collet sleeve; there is also an output cover designed to limit the compressor arm; the top of compressor arm is connected in a contacted manner to the operating mechanism by passing through the output cover; the operating mechanism pushes the compressor arm down to drive the collet sleeve to move downward, thereby releasing the collet; in addition, a tension board is arranged in the collet to fix the top-end tool. The present application is easy to operate and designed for rapid replacement of operating tools.

FIELD OF INVENTION

The present invention involves the field of invention of electric tool, especially a rapid replacing structure for multi-purpose saw.

BACKGROUND OF INVENTION

As a frequently used hand-held oscillating power tool for the industry, multi-purpose saw incorporates a variety of operational features like sawing, cutting, grinding and scraping, etc. to address different operating requirements. At present, most multi-purpose saws available on the market are designed with press board and socket head cap screw for fixing saw, which requires special tools to tighten or loosen the saw blades during replacement; such operation is complicated and time-consuming.

CONTENT OF INVENTION

In view of the existing problems in prior arts, the present invention proposes a rapid replacing structure for multi-purpose saw to resolve the defects in blade replacement for above-noted multi-purpose saw in prior arts.

The technical solution of present invention is accomplished as follows:

The rapid replacing structure for multi-purpose saw includes the operating mechanism, clamping mechanism and collet; the collet is released or clamped by driving the clamping mechanism through the operating mechanism; in addition, the structure also comprises an output shaft whose top and bottom openings form a chamber; the said collet is placed in the said chamber, where the opening of collet is on the same axis as the bottom opening of chamber output shaft; the clamping mechanism comprises a spring element that clings to the outer side of collet, a collet sleeve and a compressor arm; one end of the spring clement is connected to the bottom wall of the said chamber, while the other is connected with the collet sleeve; the said tension hoard comprises a top lever and a top ring connected to the bottom of top lever; located above the collet sleeve, the top ring also comprises an output cover that is connected with the top of output shaft and extended to the top ring of compressor arm for limiting the compressor arm; the top of the said compressor arm is connected in a contacted manner to the operating mechanism by passing through the said output cover; the operating mechanism pushes the compressor arm down to drive the collet sleeve to move downward, thereby releasing the said collet; in addition, a tension board is arranged in the collet to fix the top-end tool.

Further, the said operating mechanism comprises a earn and operation handle; the said cam is arranged above the compressor arm and connected with operation handle.

Further, the inner wall of the said compressor arm is designed with a truncated. cone-shaped lug; when the compressor arm is depressed, the truncated cone-shaped lug is inserted into the top opening of collet, thereby opening the upper part of collet.

Further, the said collet comprises a collet body created through alternate ring arrangement of a number of clamping pieces; the external contour of the said collet body includes the first cylinder at the top and the second cylinder at the bottom; the said first cylinder and second cylinder are subjected to necking connection.

Further, the inner wall of the said collet is designed with threaded clamping slot.

Compared with prior arts, the present invention offers the following benefits:

The rapid replacing structure for multi-purpose saw proposed in the present invention depresses the compressor arm through eccentric part of cam so that the upper part of collet is opened while the collet sleeve moves downward; as a result, the tension board gets out of the collet, when the saw blade can be taken out; for re-installation, the resilience of spring pushes the collet sleeve up, which drives the compressor arm up; when the compressor arm and collet get loosened, the collet returns to its original position, thereby clamping the tension board; the spring force enables collet sleeve to drive the collet to hold the tension board and saw blade for efficient replacement and easy operation of operating tools.

DESCRIPTION OF DRAWINGS

To give a clearer description of the technical solutions in the embodiments of the present invention or the prior arts, the drawings needed for the description of the embodiments or prior arts are briefly presented below. Obviously, the drawings described below deal only with some embodiments of present invention. Ordinary skill in the art can obtain other drawings based on the said drawings without making creative efforts.

FIG. 1 is the structural diagram of the rapid replacing structure for multi-purpose saw proposed in the present invention in locked state.

FIG. 2 is the structural diagram of the rapid replacing structure for multi-purpose saw proposed in the present invention in unlocked state.

FIG. 3 is the structural diagram of collet shown in FIG. 1.

SPECIFIC EMBODIMENTS

The drawings in embodiments of the present invention are used to give a clearer and more complete description of the technical solutions in embodiments of the present invention. It is obvious that the described embodiments are just part of the embodiments of the present invention. Based on embodiments of the present invention, every other embodiment achieved by the one of ordinary skill in the art without creative efforts is deemed within the protection scope of the present invention.

As shown in FIG. 1, the rapid replacing structure for multi-purpose saw includes the operating mechanism, clamping mechanism and collet; the collet is released or clamped by driving the clamping mechanism through the operating mechanism; in addition, the structure also comprises an output shaft 1 whose top and bottom openings form a chamber; the said collet 2 is placed in the said chamber, where the opening of collet is on the same axis as the bottom opening of chamber output shaft; the clamping mechanism comprises a spring element 3 that clings to the outer side of collet, a collet sleeve 4 and a compressor arm; one end of the spring element 3 is connected to the bottom wall of the said chamber, while the other is connected with the collet sleeve 4; the said tension board 15 comprises a top lever 5 and a top ring connected to the bottom of top lever; located above the collet sleeve, the top ring 6 also comprises an output cover 7 that is connected with the top of output shaft 1 and extended to the top ring 6 of compressor arm for limiting the compressor arm; the top of the said compressor arm is connected in a contacted manner to the operating mechanism by passing through the said output cover 7; the operating mechanism pushes the compressor arm down to drive the collet sleeve 4 to move downward, thereby releasing the said collet; in addition, a tension board 15 is arranged in the collet to fix the top-end tool 16; the said operating mechanism comprises a cam 8 and operation handle 9; the said cam is arranged above the compressor arm and connected with operation handle 9; the inner wall of the said compressor arm top ring 6 is designed with a truncated cone-shaped lug 10; when the compressor arm is depressed, the truncated cone-shaped lug is inserted into the top opening of collet, thereby opening the upper part of collet; the said collet comprises a collet body created through alternate ring arrangement of a number of clamping pieces 11; the external contour of the said collet body includes the first cylinder 12 at the top and the second cylinder 13 at the bottom; the said first cylinder and second cylinder are subjected to necking connection; the inner wall of the said collet is designed with threaded clamping slot 14.

FIG. 1 shows the locked state of saw blade. When the wrench is turned from position A to B, as shown in FIG. 2, the rapid replacing structure for multi-purpose saw proposed in the present invention depresses the compressor arm through eccentric part of cam so that the upper part of collet is opened while the collet sleeve moves downward; as a result, the tension board gets out of the collet, when the saw blade can be taken out; for re-installation, the resilience of spring pushes the collet sleeve up, which drives the compressor arm up; when the compressor arm and collet get loosened, the collet returns to its original position, thereby clamping the tension board; the spring force enables collet sleeve to drive the collet to hold the tension hoard and saw blade.

The above are merely preferred embodiments of the present invention, thus not being used to restrict the present invention. Any modification, equivalent replacement and improvement, etc. performed following the principles of the present invention shall be covered by the protection of the present invention. 

What is claimed is:
 1. A rapid replacing structure for multi-purpose saw, which is characterized by the fact that: It includes the operating mechanism, clamping mechanism and collet; the collet is released or clamped by driving the clamping mechanism through the operating mechanism; in addition, the structure also comprises an output shaft whose top and bottom openings form a chamber; the said collet is placed in the said chamber, where the opening of collet is on the same axis as the bottom opening of chamber output shaft; the clamping mechanism comprises a spring element that clings to the outer side of collet, a collet sleeve and a compressor arm; one end of the spring element is connected to the bottom wall of the said chamber, while the other is connected with the collet sleeve; the said tension board comprises a top lever and a top ring connected to the bottom of top lever; located above the collet sleeve, the top ring also comprises an output cover that is connected with the top of output shaft and extended to the top ring of compressor arm for limiting the compressor arm; the top of the said compressor arm is connected in a contacted manner to the operating mechanism by passing through the said output cover; the operating mechanism pushes the compressor arm down to drive the collet sleeve to move downward, thereby releasing the said collet; in addition, a tension board is arranged in the collet to fix the top-end tool.
 2. The rapid replacing structure for multi-purpose saw described in claim 1, which is characterized by the fact that the said operating mechanism comprises a cam and operation handle; the said cam is arranged above the compressor arm and connected with operation handle.
 3. The rapid replacing structure for multi-purpose saw described in claim 1, which is characterized by the fact that the inner wall of the said compressor arm is designed with a truncated cone-shaped lug; when the compressor arm is depressed, the truncated cone-shaped lug is inserted into the top opening of collet, thereby opening the upper part of collet.
 4. The rapid replacing structure for multi-purpose saw described in claim 1, which is characterized by the fact that: The said collet comprises a collet body created through alternate ring arrangement of a number of clamping pieces; the external contour of the said collet body includes the first cylinder at the top and the second cylinder at the bottom; the said first cylinder and second cylinder are subjected to necking connection.
 5. The rapid replacing structure for multi-purpose saw described in claim 1, which is characterized by the fact that: The inner wall of the said collet is designed with threaded clamping slot. 